DB2 Developer's Guide by Craig S. Mullins

By Craig S. Mullins

Study the simplest thoughts and methods from specialist writer Craig Mullins. practice those real-world items of recommendation, undocumented counsel, options, tasks, and strategies on your personal database administration procedure. Mullins provides what you want to take your DB2 improvement to the subsequent level.Written via a developer for builders, DB2 Developer¿s consultant, 5th variation offers a solutions-oriented method of studying the root and features of this newest model of the world¿s number 1 database administration system.LEARN THE techniques AND construct THE functions * enforce leading edge shortcuts, advice, tips, options, and improvement guidance to optimize all features of DB2 improvement and management * comprehend the ideas for binding DB2 program plans and applications * Use professional recommendation to enforce dispensed DB2 functions * attach your DB2 databases to the area extensive net * assessment exhaustive insurance of V6 topics¿including triggers, user-defined capabilities, kept process extensions, predictive governing, hiperspace bufferpools, the REBUILD software, the DSSIZE parameter, user-defined precise kinds, auxiliary tables, and extra * learn implementation info and assistance for big gadgets to shop multimedia data¿such as audio, video, and images¿in your DB2 for OS/390 databases (BLOBs, CLOBs, DBCLOBs, and DB2 extenders) * find out how and why to exploit the hot clarify tables - DSN_STATEMNT_TABLE and DSN_FUNCTION_TABLE * notice the best way to enforce a procedural DBA functionality to regulate triggers, kept methods, and UDFs"

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When CASE is used in place of multiple UNIONs, performance most likely will be improved because DB2 will make fewer passes against the data to return a result set. In the preceding example, one pass is required instead of three. There are two types of CASE expressions: those with a simple WHEN clause and those with a searched WHEN clause. The previous example depicts a simple WHEN clause. Simple WHEN clauses only test for equality of an expression. Searched WHEN clauses provide more complex expression testing.

As of DB2 Version 7, views can contain the UNION and UNION ALL clauses. This brings much more flexibility to views and makes UNION more useful, too. Outer Join As discussed previously, when tables are joined, the rows that are returned contain matching values for the columns specified in the join predicates. Sometimes, however, it is desirable to return both matching and non-matching rows for one or more of the tables being joined. This is known as an outer join. Prior to V4, DB2 did not explicitly support outer joins.

If you need to squeeze the most performance from a system, however, try rewriting multi-table data retrieval SQL SELECT statements as both a join and a subquery. Test the performance of each SQL formulation and use the one that performs best. Union The union operation combines two sets of rows into a single result set composed of all the rows in both of the two original sets. The two original sets must be union-compatible. For union compatibility • The two sets must contain the same number of columns.

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